Whats the relationship between front derailleur angle and shifting performance, and how do factors like frame design, derailleur type, and cable tension affect this relationship? Are there any general guidelines for optimizing front derailleur angle to achieve smooth and precise shifting, or does it ultimately come down to trial and error? How do different manufacturers approach front derailleur angle in their designs, and are there any notable differences between road, mountain, and hybrid bikes? Can a slight miscalculation in front derailleur angle lead to significant performance issues, or is it a relatively minor consideration in the grand scheme of bike maintenance?